Goodwood (Ultimate High) and White Waltham (West London Aero Club) both do aerobatic instruction in T67s, have excellent instructors and good safety records - if you wanted to try out, I'd go to one of those.
White Waltham I'm sure could do the whole SEP rating happily in it, which doesn't seem a bad idea if seriously considering buying one.
But I'd still rather own a Bulldog
I just think it's a far more enjoyable aeroplane to fly - and there are a few with rear seats. Some Bulldogs are not fatigue life limited.
I mentioned the Auster earlier - a type I know passably well - I'd personally not own one with a Gypsy Major or Cirrus: just because of the age and running costs of those engines, nor unless I had a hangar to keep it in available. But there are 3-seaters, it has a basic aerobatic capability, and they are an absolute joy to throw around, as well as being great for strip flying.
G